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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d928a816c5fe68348e387d6cb7eb25a1c174e5aba5aa63c01bd93fdce4fdddc' 
  AND token = '7RAic6Xi+VXTTTOu4VTvIF2ouEHHGKK+vJVEnHNjTV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}